Run, choose and add

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Suggested content:

Select strategies flexibly to solve addition and subtraction problems of up to 3 digits

Apply known mental strategies that use partitioning to add and subtract, such as bridging the decades
Use the compensation strategy to add and subtract (Reasons about relations)
Apply the levelling and constant difference strategies (Reasons about relations)
Represent solutions to addition and subtraction problems, including word problems, using an empty number line or bar model
Compare and evaluate strategies used to solve addition and subtraction problems, reasoning which strategy may be most efficient

Coloured drawing of students playing 'Run, choose and add'.

Equipment

Bean bags or cards numbered 1 – 9 (1 set per 2 students)
Whiteboards and markers
Cones or markers
1 hoop per student pair

Activity set-up

Teacher places numbered bean bags or cards in a hoop and a cone/marker 10 metres from the hoop for each student pair.
Students draw an addition grid like the one below on the asphalt, a whiteboard or in their workbook.

Blank number sentence. 2 digit number plus a 2 digit number equals a 2 digit number.

How to play

A two-player game where students take turns to run and collect bean bags from a hoop. Using their number sense, they create equations (number sentences) where the closest to a total of 100 wins.

Students take turns to run and collect a bean bag from the hoop.
After each collection, each student decides which of their cells to put that number in.
Students take it in turns to run, choose and place in the grid until all the cells are full.
Students choose an efficient strategy to solve the sum they created.
Whoever has the sum closer to 100 wins and earns a point.
The first player with 10 points is the overall winner.

Variations

Choose a higher or lower target number, eg. 1000.
Draw a grid to add single digit numbers.
Draw a grid to add a 2-digit number and a single digit number

Additive relations